CN113821890A - Device and method for predicting fatigue life of wind turbine blades - Google Patents
Device and method for predicting fatigue life of wind turbine blades Download PDFInfo
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Abstract
一种风电机组叶片疲劳寿命预测装置和方法，装置包括测试箱，所述测试箱的两端侧壁均贯穿开设有进出口，所述测试箱的端部转动连接有密封门，所述测试箱的内壁固定有多个导向杆，多个所述导向杆的周向侧壁共同滑动连接有支撑板，所述测试箱的内壁通过轴承转动连接有两个对称设置的调节杆，所述两个调节杆均与支撑板贯穿转动连接，所述支撑板的侧壁贯穿开设有通槽，所述通槽与两个进出口对应，两个所述进出口和通槽内壁均滑动连接有压板，测量方法是通过上述装置，能够实现多点的同时测量，可大大减少测量次数，能够有效增加预测装置的测量效率，可便于对风电机组叶片的疲劳寿命预测使用。
A wind turbine blade fatigue life prediction device and method, the device includes a test box, the two end side walls of the test box are provided with inlets and outlets, the ends of the test box are rotatably connected with a sealing door, and the test box The inner wall of the test box is fixed with a plurality of guide rods, the circumferential side walls of the plurality of the guide rods are jointly slidably connected with a support plate, and the inner wall of the test box is rotatably connected with two symmetrically arranged adjustment rods. The adjusting rods are all connected with the support plate through rotation, the side wall of the support plate is provided with a through groove, the through groove corresponds to the two inlet and outlet, and the two inlet and outlet and the inner wall of the through groove are slidably connected with a pressure plate, The measurement method is that through the above device, simultaneous measurement of multiple points can be realized, the number of measurements can be greatly reduced, the measurement efficiency of the prediction device can be effectively increased, and the fatigue life prediction of the blades of the wind turbine can be facilitated.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a device and a method for predicting the fatigue life of a blade of a wind turbine generator.
Background
The wind power generator is an electric power device which converts wind energy into mechanical work, and the mechanical work drives a rotor to rotate so as to finally output alternating current. The wind power generator generally comprises wind wheels, a generator, a direction regulator, a tower frame, a speed-limiting safety mechanism, an energy storage device and other components, is a heat energy utilization generator taking the sun as a heat source and taking the atmosphere as a working medium, and a wind power blade is the most pipe fitting component inside the wind power generator, so that the requirement on the wind power blade is high in the production process, and the fatigue life of the blade is usually predicted by using a measuring device before use so as to determine the replacement period in the later period.
Traditional measuring method mode is comparatively single, can't adopt single multiple spot simultaneous measurement, need carry out a lot of independent measurement, can influence its prediction efficiency, causes the sled of blade in the measurement process easily moreover to can form great error to measured data, and then make the measured data accuracy lower.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device and a method for predicting the fatigue life of a wind turbine blade, which solve the problems of low efficiency and low measurement accuracy in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fatigue life prediction device for a wind turbine generator blade comprises a test box 1, wherein the side walls of two ends of the test box 1 are respectively provided with an inlet and an outlet 2 in a penetrating way, the end part of the test box 1 is rotatably connected with a sealing door 3, the inner wall of the test box 1 is fixedly provided with a plurality of guide rods 4, the circumferential side walls of the guide rods 4 are jointly and slidably connected with a support plate 6, the inner wall of the test box 1 is rotatably connected with two symmetrically arranged adjusting rods 5 through bearings, the two adjusting rods 5 are respectively rotatably connected with the support plate 6 in a penetrating way, the side wall of the support plate 6 is provided with a through groove 7 in a penetrating way, the through groove 7 corresponds to the two inlet and outlet 2, the side wall of the support plate 6 is rotatably connected with two horizontal plates 11 in a penetrating way, the two horizontal plates 11 are correspondingly arranged, one side, which is close to the two horizontal plates 11, is respectively provided with a plurality of measuring blocks 14, and each measuring block 14 is internally provided with a measuring device, the end walls of the two horizontal plates 11 are both provided with thread grooves 12, screw rods 13 are arranged in the thread grooves 12, the screw rods 13 are rotatably connected to the inner wall of the test box 1 through bearings, and the side wall of the test box 1 is provided with a connecting device;
the two inlets and outlets 2 and the inner walls of the through grooves 7 are connected with pressing plates 8 in a sliding mode, the inner tops of the two inlets and outlets 2 and the inner tops of the through grooves 7 are fixed with limiting push rods 9, the rod heads of the limiting push rods 9 are fixed with the upper ends of the corresponding pressing plates 8, and the bottoms of the pressing plates 8 are glued with contact layers 10.
Measuring device is including being fixed in the measuring push rod 21 of bottom in the measuring block 14, the pole head department of measuring push rod 21 is fixed with connecting plate 22, and connecting plate 22 offsets with measuring 14 inner walls are sealed, and the upper end of connecting plate 22 is fixed with response piece 23 and contact ball 24, contact ball 24 is the cavity type hemisphere, response piece 23 is located inside the contact ball 24.
The connecting device comprises a motor 15 fixed at one side end part of the test box 1, a main shaft of the motor 15 penetrates through the inner wall of the test box 1 and is fixed with the adjusting rod 5 at the lower end, the other side end part of the test box 1 is rotatably connected with two first rotating rods 16 and two second rotating rods 17 through bearings, the end parts of the two first rotating rods 16 and the two second rotating rods 17 penetrate into the test box 1, the two first rotating rods 16 are correspondingly fixed with the two adjusting rods 5, and the two second rotating rods 17 are correspondingly fixed with the two screw rods 13; the circumferential side walls of the two first rotating rods 16 are respectively fixed with a first gear 18, the circumferential side walls of the two second rotating rods 17 are respectively fixed with a second gear 19, the two first gears 18 are correspondingly meshed with the two second gears 19, and the circumferential side walls of the two first rotating rods 16 are jointly sleeved with a belt 20.
The number of teeth of the first gear 18 is half of the number of teeth of the second gear 19.
The prediction method based on the wind turbine generator blade fatigue life prediction device is characterized by comprising the following steps:
the method comprises the following steps: limiting clamp
Before predicting the fatigue life of the wind turbine blade, firstly, the wind turbine blade needs to be placed in a test box 1, so that the wind turbine blade is parked at the upper ends of an inlet and outlet 2 and a through groove 7, and then a limiting push rod 9 is used for pushing a pressing plate 8 to move, so that a contact layer 10 at the bottom of the pressing plate 8 is tightly attached to the surface of the wind turbine blade;
step two: single-point measurement using a measuring device
A measuring push rod 21 in the measuring block 14 is used for pushing the connecting plate 22 to move towards the direction of the blades of the wind turbine generator, so that a contact ball 24 at the upper end of the connecting plate 22 is abutted against the blades of the wind turbine generator, and an induction block 23 in the contact ball 24 is used for carrying out induction measurement on the stress of each point of the blades of the wind turbine generator;
step three: adjusting the measuring position
When other parts are measured, firstly, the limiting push rod 9 in the through groove 7 needs to be reset, then the motor 15 is started, the adjusting rod 5 is driven to rotate through the rotation of the motor 15, so that the supporting plate 6 can be moved, and the horizontal plate 11 can be moved under the driving of the first rotating rod 16, the second rotating rod 17, the first gear 18 and the second gear 19, so that the position of the measuring block 14 can be changed, and further, the stress of different positions of the blades of the wind turbine generator can be measured;
step four: plotting S-N curves using multi-point measurement data
Through multi-point measurement, filtering processing is carried out on the electric signals transmitted by the induction block 23 by using external equipment, the electric signals are converted into actual numerical values, and then the measured numerical values are used for drawing an S-N curve which takes the fatigue strength as a vertical coordinate and takes the logarithmic value of the fatigue life as a horizontal coordinate and shows the relation between the fatigue strength and the fatigue life of the wind turbine blade;
step five: blade fatigue life prediction using S-N curve
And finally, predicting the fatigue life of the wind turbine generator blade by utilizing the S-N curve, so that the fatigue life of the wind turbine generator blade with higher accuracy can be obtained.
The belt 20 drives the horizontal plates 11 at the upper and lower ends to simultaneously move in the same direction, so that the upper and lower ends of the measurement part can be measured simultaneously.
The contact layer 10 and the contact ball 24 are both made of rubber materials.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, two symmetrical measuring devices are arranged at the upper end of the same horizontal plate, so that simultaneous measurement of multiple points can be realized, the measuring times can be greatly reduced, the measuring efficiency of the predicting device can be effectively increased, and the fatigue life of the wind turbine blade can be conveniently predicted and used.
2. According to the invention, the number of teeth of the first gear is half of that of the second gear, and meanwhile, the moving distance of the horizontal plate is half of that of the supporting plate, so that the measuring block is always positioned between the supporting plate and the end part of the testing box, two ends of the blade measuring part of the wind turbine generator can be clamped tightly, and the measured data can be more accurate.
3. In the invention, in the moving process of the horizontal plates, the horizontal plates at the upper end and the lower end can simultaneously move in the same direction under the driving of the belt, so that the upper end and the lower end of a measuring part can be simultaneously measured, the stability of the blades of the wind turbine generator can be ensured, and the accuracy of measured data can be higher.
4. According to the invention, the contact layer and the contact ball are made of rubber materials, so that the integrity of the wind turbine blade can be ensured in the process of clamping and measuring the wind turbine blade, the damage to the surface of the wind turbine blade can be avoided, the error of the prediction result of the wind turbine blade is smaller, and the accuracy is higher.
Drawings
Fig. 1 is a schematic structural diagram of a wind turbine blade fatigue life prediction device provided by the invention.
Fig. 2 is a top sectional view of a fatigue life predicting apparatus for a wind turbine blade according to the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 1.
Fig. 4 is a schematic diagram of a measuring device in the fatigue life predicting device for the wind turbine blade according to the present invention.
Fig. 5 is a side view of a fatigue life prediction device for a wind turbine blade according to the present invention.
In the figure: the device comprises a test box 1, an inlet and an outlet 2, a sealing door 3, a guide rod 4, an adjusting rod 5, a supporting plate 6, a through groove 7, a pressing plate 8, a limit push rod 9, a contact layer 10, a horizontal plate 11, a thread groove 12, a screw rod 13, a measuring block 14, a motor 15, a first rotating rod 16, a second rotating rod 17, a first gear 18, a second gear 19, a belt 20, a measuring push rod 21, a connecting plate 22, an induction block 23 and a contact ball 24.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Referring to fig. 1-3, a fatigue life prediction device for a wind turbine generator blade comprises a test box 1, wherein the side walls of two ends of the test box 1 are respectively provided with an inlet and an outlet 2 in a penetrating way, the end part of the test box 1 is rotatably connected with a sealing door 3, the inner wall of the test box 1 is fixed with a plurality of guide rods 4, the circumferential side walls of the guide rods 4 are jointly and slidably connected with a support plate 6, the inner wall of the test box 1 is rotatably connected with two symmetrically arranged adjusting rods 5 through bearings, the two adjusting rods 5 are respectively rotatably connected with the support plate 6 in a penetrating way, the side wall of the support plate 6 is provided with a through groove 7 in a penetrating way, the through groove 7 corresponds to the two inlet and outlet 2, the inner walls of the two inlet and outlet 2 and the through groove 7 are respectively and slidably connected with a pressing plate 8, the inner tops of the two inlet and outlet 2 and the through groove 7 are respectively fixed with a limit push rod 9, the rod head of each limit push rod 9 is fixed with the upper end of the corresponding pressing plate 8, the bottom of each pressing plate 8 is glued with a contact layer 10, the lateral wall of backup pad 6 runs through sliding connection and has two horizontal plates 11, two horizontal plates 11 correspond the setting, one side that two horizontal plates 11 are close to mutually all is fixed with a plurality of measuring blocks 14, the inside of every measuring block 14 all is provided with measuring device, thread groove 12 has all been seted up to the end wall of two horizontal plates 11, the inner wall of test box 1 rotates through the bearing and is connected with two lead screws 13, lead screw 13 is located inside thread groove 12, the lateral wall of test box 1 is provided with connecting device.
The connecting device comprises a motor 15 fixed at one side end part of the test box 1, a main shaft of the motor 15 penetrates through the inner wall of the test box 1 and is fixed with the adjusting rod 5 at the lower end, the other side end part of the test box 1 is rotatably connected with two first rotating rods 16 and two second rotating rods 17 through bearings, the end parts of the two first rotating rods 16 and the two second rotating rods 17 penetrate into the test box 1, the two first rotating rods 16 are correspondingly fixed with the two adjusting rods 5, and the two second rotating rods 17 are correspondingly fixed with the two screw rods 13; the circumferential side walls of the two first rotating rods 16 are all fixed with first gears 18, the circumferential side walls of the two second rotating rods 17 are all fixed with second gears 19, the two first gears 18 are correspondingly meshed with the two second gears 19, the circumferential side walls of the two first rotating rods 16 are jointly sleeved with a belt 20, and the adjusting rod 6 and the screw rod 13 are threaded rods.
Referring to fig. 4, the measuring device includes a measuring push rod 21 fixed at the bottom inside the measuring block 14, a connecting plate 22 is fixed at the rod head of the measuring push rod 21, the connecting plate 22 abuts against the inner wall of the measuring block 14 in a sealing manner, an induction block 23 and a contact ball 24 are fixed at the upper end of the connecting plate 22, the contact ball 24 is a hollow hemisphere, the induction block 23 is located inside the contact ball 24, and the measuring push rod 21 and the limit push rod 9 are both electric push rods.
The number of teeth of the first gear 18 is half of the number of teeth of the second gear 19.
A method for predicting the fatigue life of a wind turbine blade comprises the following steps:
the method comprises the following steps: limiting clamp
Before predicting the fatigue life of the wind turbine blade, the wind turbine blade is placed in the test box 1, the wind turbine blade is parked at the upper ends of the inlet and outlet 2 and the through groove 7, then the pressure plate 8 is pushed to move by the limiting push rod 9, the contact layer 10 at the bottom of the pressure plate 8 is tightly attached to the surface of the wind turbine blade, the stability of the wind turbine blade in the measuring process is ensured, and the measured data are more accurate;
step two: single-point measurement using a measuring device
A measuring push rod 21 in the measuring block 14 is used for pushing the connecting plate 22 to move towards the direction of the blades of the wind turbine generator, so that a contact ball 24 at the upper end of the connecting plate 22 is abutted against the blades of the wind turbine generator, and an induction block 23 in the contact ball 24 is used for carrying out induction measurement on the stress of each point of the blades of the wind turbine generator;
step three: adjusting the measuring position
When other parts are measured, firstly, the limiting push rod 9 in the through groove 7 needs to be reset, then the motor 15 is started, the adjusting rod 5 is driven to rotate through the rotation of the motor 15, so that the supporting plate 6 can be moved, and the horizontal plate 11 can be moved under the driving of the first rotating rod 16, the second rotating rod 17, the first gear 18 and the second gear 19, so that the position of the measuring block 14 can be changed, further, the stress of different positions of the blades of the wind turbine generator can be measured, the measurement of multiple different positions can be realized, and the accidental nature of data collection can be avoided;
step four: plotting S-N curves using multi-point measurement data
The electric signals transmitted by the induction block 23 are filtered through external equipment, the electric signals are converted into actual numerical values, then measured numerical values are utilized to draw an S-N curve which takes the fatigue strength as a vertical coordinate and takes a logarithmic value of the fatigue life as a horizontal coordinate and shows the relation between the fatigue strength and the fatigue life of the blades of the wind turbine generator, and the accuracy of the S-N curve can be higher through multi-point measurement;
step five: blade fatigue life prediction using S-N curve
And finally, predicting the fatigue life of the wind turbine blade by utilizing the S-N curve, so that the fatigue life of the wind turbine blade with higher accuracy can be obtained, and the wind turbine blade can be conveniently used.
The first rotating rod 16 and the second rotating rod 17 are meshed and connected through the first gear 18 and the second gear 19, the number of teeth of the first gear 18 is half of that of the second gear 19, the horizontal plate 11 can move in the process that the adjusting rod 5 drives the supporting plate 6 to move, meanwhile, the moving distance of the horizontal plate 11 is half of that of the supporting plate 6, the measuring block 14 can be located between the supporting plate 6 and the end part of the testing box 1 all the time, both ends of the blade measuring part of the wind turbine generator can be clamped, and the measured data are more accurate; the belt 20 drives the horizontal plates 11 at the upper end and the lower end to simultaneously move in the same direction, so that the upper end and the lower end of a measurement part can be simultaneously measured, the stability of the blades of the wind turbine generator can be ensured, and the accuracy of measurement data can be higher; the contact layer 10 and the contact ball 24 are made of rubber materials, so that the completeness of the wind turbine blade can be guaranteed in the process of clamping and measuring the wind turbine blade, the damage to the surface of the wind turbine blade can be avoided, the error of the prediction result of the wind turbine blade is small, and the accuracy is high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115493830A (en) * | 2022-10-20 | 2022-12-20 | 华能新能源股份有限公司 | Method and device for predicting fatigue life of blades of wind turbine generator |
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| CN113821890B (en) | 2024-03-12 |
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